Convert from SwiftUI.Font to UIFont

Question

I have a UIViewRepresentable with a UITextView and I want to set the font on the UITextView using the Font from the SwiftUI environment. I just need a simple init like:

Answer 1

No you can't, you have to use the params you passed to the Font to create UIFont

Answer 2

A bit of a hack but works (doing the other direction is left as an exercise to the reader).

extension UIFont {
    class func with(font: Font) -> UIFont {
        let uiFont: UIFont
        
        switch font {
        case .largeTitle:
            uiFont = UIFont.preferredFont(forTextStyle: .largeTitle)
        case .title:
            uiFont = UIFont.preferredFont(forTextStyle: .title1)
        case .title2:
            uiFont = UIFont.preferredFont(forTextStyle: .title2)
        case .title3:
            uiFont = UIFont.preferredFont(forTextStyle: .title3)
        case .headline:
            uiFont = UIFont.preferredFont(forTextStyle: .headline)
        case .subheadline:
            uiFont = UIFont.preferredFont(forTextStyle: .subheadline)
        case .callout:
            uiFont = UIFont.preferredFont(forTextStyle: .callout)
        case .caption:
            uiFont = UIFont.preferredFont(forTextStyle: .caption1)
        case .caption2:
            uiFont = UIFont.preferredFont(forTextStyle: .caption2)
        case .footnote:
            uiFont = UIFont.preferredFont(forTextStyle: .footnote)
        case .body:
            fallthrough
        default:
            uiFont = UIFont.preferredFont(forTextStyle: .body)
        }
        
        return uiFont
    }
}